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Comparing jsr166/src/test/tck/AtomicLongArrayTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:07 2003 UTC vs.
Revision 1.38 by dl, Tue Jan 26 13:33:05 2021 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
10	<	import java.util.concurrent.atomic.*;
11	<	import java.io.*;
9	>	import java.util.Arrays;
10	>	import java.util.concurrent.atomic.AtomicLongArray;
11	>
12	>	import junit.framework.Test;
13	>	import junit.framework.TestSuite;
14
15		public class AtomicLongArrayTest extends JSR166TestCase {
16	<	public static void main (String[] args) {
17	<	junit.textui.TestRunner.run (suite());
16	>	public static void main(String[] args) {
17	>	main(suite(), args);
18		}
19		public static Test suite() {
20		return new TestSuite(AtomicLongArrayTest.class);
21		}
22
23		/**
24	<	*
24	>	* constructor creates array of given size with all elements zero
25	>	*/
26	>	public void testConstructor() {
27	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
28	>	for (int i = 0; i < SIZE; i++)
29	>	assertEquals(0, aa.get(i));
30	>	}
31	>
32	>	/**
33	>	* constructor with null array throws NPE
34	>	*/
35	>	public void testConstructor2NPE() {
36	>	try {
37	>	long[] a = null;
38	>	new AtomicLongArray(a);
39	>	shouldThrow();
40	>	} catch (NullPointerException success) {}
41	>	}
42	>
43	>	/**
44	>	* constructor with array is of same size and has all elements
45	>	*/
46	>	public void testConstructor2() {
47	>	long[] a = { 17L, 3L, -42L, 99L, -7L };
48	>	AtomicLongArray aa = new AtomicLongArray(a);
49	>	assertEquals(a.length, aa.length());
50	>	for (int i = 0; i < a.length; i++)
51	>	assertEquals(a[i], aa.get(i));
52	>	}
53	>
54	>	/**
55	>	* get and set for out of bound indices throw IndexOutOfBoundsException
56	>	*/
57	>	@SuppressWarnings("deprecation")
58	>	public void testIndexing() {
59	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
60	>	for (int index : new int[] { -1, SIZE }) {
61	>	try {
62	>	aa.get(index);
63	>	shouldThrow();
64	>	} catch (IndexOutOfBoundsException success) {}
65	>	try {
66	>	aa.set(index, 1);
67	>	shouldThrow();
68	>	} catch (IndexOutOfBoundsException success) {}
69	>	try {
70	>	aa.lazySet(index, 1);
71	>	shouldThrow();
72	>	} catch (IndexOutOfBoundsException success) {}
73	>	try {
74	>	aa.compareAndSet(index, 1, 2);
75	>	shouldThrow();
76	>	} catch (IndexOutOfBoundsException success) {}
77	>	try {
78	>	aa.weakCompareAndSet(index, 1, 2);
79	>	shouldThrow();
80	>	} catch (IndexOutOfBoundsException success) {}
81	>	try {
82	>	aa.getAndAdd(index, 1);
83	>	shouldThrow();
84	>	} catch (IndexOutOfBoundsException success) {}
85	>	try {
86	>	aa.addAndGet(index, 1);
87	>	shouldThrow();
88	>	} catch (IndexOutOfBoundsException success) {}
89	>	}
90	>	}
91	>
92	>	/**
93	>	* get returns the last value set at index
94		*/
95	<	public void testConstructor(){
96	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
97	<	for (int i = 0; i < SIZE; ++i)
98	<	assertEquals(0,ai.get(i));
95	>	public void testGetSet() {
96	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
97	>	for (int i = 0; i < SIZE; i++) {
98	>	aa.set(i, 1);
99	>	assertEquals(1, aa.get(i));
100	>	aa.set(i, 2);
101	>	assertEquals(2, aa.get(i));
102	>	aa.set(i, -3);
103	>	assertEquals(-3, aa.get(i));
104	>	}
105		}
106
107		/**
108	<	*
108	>	* get returns the last value lazySet at index by same thread
109		*/
110	<	public void testGetSet(){
111	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
112	<	for (int i = 0; i < SIZE; ++i) {
113	<	ai.set(i, 1);
114	<	assertEquals(1,ai.get(i));
115	<	ai.set(i, 2);
116	<	assertEquals(2,ai.get(i));
117	<	ai.set(i, -3);
118	<	assertEquals(-3,ai.get(i));
110	>	public void testGetLazySet() {
111	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
112	>	for (int i = 0; i < SIZE; i++) {
113	>	aa.lazySet(i, 1);
114	>	assertEquals(1, aa.get(i));
115	>	aa.lazySet(i, 2);
116	>	assertEquals(2, aa.get(i));
117	>	aa.lazySet(i, -3);
118	>	assertEquals(-3, aa.get(i));
119		}
120		}
121
122		/**
123	<	*
123	>	* compareAndSet succeeds in changing value if equal to expected else fails
124		*/
125	<	public void testCompareAndSet(){
126	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
127	<	for (int i = 0; i < SIZE; ++i) {
128	<	ai.set(i, 1);
129	<	assertTrue(ai.compareAndSet(i, 1,2));
130	<	assertTrue(ai.compareAndSet(i, 2,-4));
131	<	assertEquals(-4,ai.get(i));
132	<	assertFalse(ai.compareAndSet(i, -5,7));
133	<	assertFalse((7 == ai.get(i)));
134	<	assertTrue(ai.compareAndSet(i, -4,7));
135	<	assertEquals(7,ai.get(i));
125	>	public void testCompareAndSet() {
126	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
127	>	for (int i = 0; i < SIZE; i++) {
128	>	aa.set(i, 1);
129	>	assertTrue(aa.compareAndSet(i, 1, 2));
130	>	assertTrue(aa.compareAndSet(i, 2, -4));
131	>	assertEquals(-4, aa.get(i));
132	>	assertFalse(aa.compareAndSet(i, -5, 7));
133	>	assertEquals(-4, aa.get(i));
134	>	assertTrue(aa.compareAndSet(i, -4, 7));
135	>	assertEquals(7, aa.get(i));
136		}
137		}
138
139		/**
140	<	*
140	>	* compareAndSet in one thread enables another waiting for value
141	>	* to succeed
142		*/
143	<	public void testWeakCompareAndSet(){
144	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
145	<	for (int i = 0; i < SIZE; ++i) {
146	<	ai.set(i, 1);
147	<	while(!ai.weakCompareAndSet(i, 1,2));
148	<	while(!ai.weakCompareAndSet(i, 2,-4));
149	<	assertEquals(-4,ai.get(i));
150	<	while(!ai.weakCompareAndSet(i, -4,7));
151	<	assertEquals(7,ai.get(i));
143	>	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
144	>	final AtomicLongArray a = new AtomicLongArray(1);
145	>	a.set(0, 1);
146	>	Thread t = new Thread(new CheckedRunnable() {
147	>	public void realRun() {
148	>	while (!a.compareAndSet(0, 2, 3))
149	>	Thread.yield();
150	>	}});
151	>
152	>	t.start();
153	>	assertTrue(a.compareAndSet(0, 1, 2));
154	>	t.join(LONG_DELAY_MS);
155	>	assertFalse(t.isAlive());
156	>	assertEquals(3, a.get(0));
157	>	}
158	>
159	>	/**
160	>	* repeated weakCompareAndSet succeeds in changing value when equal
161	>	* to expected
162	>	*/
163	>	@SuppressWarnings("deprecation")
164	>	public void testWeakCompareAndSet() {
165	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
166	>	for (int i = 0; i < SIZE; i++) {
167	>	aa.set(i, 1);
168	>	do {} while (!aa.weakCompareAndSet(i, 1, 2));
169	>	do {} while (!aa.weakCompareAndSet(i, 2, -4));
170	>	assertEquals(-4, aa.get(i));
171	>	do {} while (!aa.weakCompareAndSet(i, -4, 7));
172	>	assertEquals(7, aa.get(i));
173		}
174		}
175
176		/**
177	<	*
177	>	* getAndSet returns previous value and sets to given value at given index
178		*/
179	<	public void testGetAndSet(){
180	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
181	<	for (int i = 0; i < SIZE; ++i) {
182	<	ai.set(i, 1);
183	<	assertEquals(1,ai.getAndSet(i,0));
184	<	assertEquals(0,ai.getAndSet(i,-10));
185	<	assertEquals(-10,ai.getAndSet(i,1));
179	>	public void testGetAndSet() {
180	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
181	>	for (int i = 0; i < SIZE; i++) {
182	>	aa.set(i, 1);
183	>	assertEquals(1, aa.getAndSet(i, 0));
184	>	assertEquals(0, aa.getAndSet(i, -10));
185	>	assertEquals(-10, aa.getAndSet(i, 1));
186		}
187		}
188
189		/**
190	<	*
190	>	* getAndAdd returns previous value and adds given value
191		*/
192	<	public void testGetAndAdd(){
193	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
194	<	for (int i = 0; i < SIZE; ++i) {
195	<	ai.set(i, 1);
196	<	assertEquals(1,ai.getAndAdd(i,2));
197	<	assertEquals(3,ai.get(i));
198	<	assertEquals(3,ai.getAndAdd(i,-4));
199	<	assertEquals(-1,ai.get(i));
192	>	public void testGetAndAdd() {
193	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
194	>	for (int i = 0; i < SIZE; i++) {
195	>	aa.set(i, 1);
196	>	assertEquals(1, aa.getAndAdd(i, 2));
197	>	assertEquals(3, aa.get(i));
198	>	assertEquals(3, aa.getAndAdd(i, -4));
199	>	assertEquals(-1, aa.get(i));
200		}
201		}
202
203		/**
204	<	*
204	>	* getAndDecrement returns previous value and decrements
205		*/
206	<	public void testGetAndDecrement(){
207	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
208	<	for (int i = 0; i < SIZE; ++i) {
209	<	ai.set(i, 1);
210	<	assertEquals(1,ai.getAndDecrement(i));
211	<	assertEquals(0,ai.getAndDecrement(i));
212	<	assertEquals(-1,ai.getAndDecrement(i));
206	>	public void testGetAndDecrement() {
207	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
208	>	for (int i = 0; i < SIZE; i++) {
209	>	aa.set(i, 1);
210	>	assertEquals(1, aa.getAndDecrement(i));
211	>	assertEquals(0, aa.getAndDecrement(i));
212	>	assertEquals(-1, aa.getAndDecrement(i));
213		}
214		}
215
216		/**
217	<	*
217	>	* getAndIncrement returns previous value and increments
218		*/
219	<	public void testGetAndIncrement(){
220	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
221	<	for (int i = 0; i < SIZE; ++i) {
222	<	ai.set(i, 1);
223	<	assertEquals(1,ai.getAndIncrement(i));
224	<	assertEquals(2,ai.get(i));
225	<	ai.set(i,-2);
226	<	assertEquals(-2,ai.getAndIncrement(i));
227	<	assertEquals(-1,ai.getAndIncrement(i));
228	<	assertEquals(0,ai.getAndIncrement(i));
229	<	assertEquals(1,ai.get(i));
219	>	public void testGetAndIncrement() {
220	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
221	>	for (int i = 0; i < SIZE; i++) {
222	>	aa.set(i, 1);
223	>	assertEquals(1, aa.getAndIncrement(i));
224	>	assertEquals(2, aa.get(i));
225	>	aa.set(i, -2);
226	>	assertEquals(-2, aa.getAndIncrement(i));
227	>	assertEquals(-1, aa.getAndIncrement(i));
228	>	assertEquals(0, aa.getAndIncrement(i));
229	>	assertEquals(1, aa.get(i));
230		}
231		}
232
233		/**
234	<	*
234	>	* addAndGet adds given value to current, and returns current value
235		*/
236		public void testAddAndGet() {
237	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
238	<	for (int i = 0; i < SIZE; ++i) {
239	<	ai.set(i, 1);
240	<	assertEquals(3,ai.addAndGet(i,2));
241	<	assertEquals(3,ai.get(i));
242	<	assertEquals(-1,ai.addAndGet(i,-4));
243	<	assertEquals(-1,ai.get(i));
237	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
238	>	for (int i = 0; i < SIZE; i++) {
239	>	aa.set(i, 1);
240	>	assertEquals(3, aa.addAndGet(i, 2));
241	>	assertEquals(3, aa.get(i));
242	>	assertEquals(-1, aa.addAndGet(i, -4));
243	>	assertEquals(-1, aa.get(i));
244		}
245		}
246
247		/**
248	<	*
248	>	* decrementAndGet decrements and returns current value
249		*/
250	<	public void testDecrementAndGet(){
251	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
252	<	for (int i = 0; i < SIZE; ++i) {
253	<	ai.set(i, 1);
254	<	assertEquals(0,ai.decrementAndGet(i));
255	<	assertEquals(-1,ai.decrementAndGet(i));
256	<	assertEquals(-2,ai.decrementAndGet(i));
257	<	assertEquals(-2,ai.get(i));
250	>	public void testDecrementAndGet() {
251	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
252	>	for (int i = 0; i < SIZE; i++) {
253	>	aa.set(i, 1);
254	>	assertEquals(0, aa.decrementAndGet(i));
255	>	assertEquals(-1, aa.decrementAndGet(i));
256	>	assertEquals(-2, aa.decrementAndGet(i));
257	>	assertEquals(-2, aa.get(i));
258		}
259		}
260
261		/**
262	<	*
262	>	* incrementAndGet increments and returns current value
263		*/
264		public void testIncrementAndGet() {
265	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
266	<	for (int i = 0; i < SIZE; ++i) {
267	<	ai.set(i, 1);
268	<	assertEquals(2,ai.incrementAndGet(i));
269	<	assertEquals(2,ai.get(i));
270	<	ai.set(i, -2);
271	<	assertEquals(-1,ai.incrementAndGet(i));
272	<	assertEquals(0,ai.incrementAndGet(i));
273	<	assertEquals(1,ai.incrementAndGet(i));
274	<	assertEquals(1,ai.get(i));
265	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
266	>	for (int i = 0; i < SIZE; i++) {
267	>	aa.set(i, 1);
268	>	assertEquals(2, aa.incrementAndGet(i));
269	>	assertEquals(2, aa.get(i));
270	>	aa.set(i, -2);
271	>	assertEquals(-1, aa.incrementAndGet(i));
272	>	assertEquals(0, aa.incrementAndGet(i));
273	>	assertEquals(1, aa.incrementAndGet(i));
274	>	assertEquals(1, aa.get(i));
275		}
276		}
277
278	<	static final long COUNTDOWN = 100000;
279	<
280	<	class Counter implements Runnable {
281	<	final AtomicLongArray ai;
282	<	volatile long counts;
183	<	Counter(AtomicLongArray a) { ai = a; }
184	<	public void run() {
278	>	class Counter extends CheckedRunnable {
279	>	final AtomicLongArray aa;
280	>	int decs;
281	>	Counter(AtomicLongArray a) { aa = a; }
282	>	public void realRun() {
283		for (;;) {
284		boolean done = true;
285	<	for (int i = 0; i < ai.length(); ++i) {
286	<	long v = ai.get(i);
287	<	threadAssertTrue(v >= 0);
285	>	for (int i = 0; i < aa.length(); i++) {
286	>	long v = aa.get(i);
287	>	assertTrue(v >= 0);
288		if (v != 0) {
289		done = false;
290	<	if (ai.compareAndSet(i, v, v-1))
291	<	++counts;
290	>	if (aa.compareAndSet(i, v, v - 1))
291	>	decs++;
292		}
293		}
294		if (done)
#	Line 200 | Line 298 | public class AtomicLongArrayTest extends
298		}
299
300		/**
301	<	*
301	>	* Multiple threads using same array of counters successfully
302	>	* update a number of times equal to total count
303		*/
304	<	public void testCountingInMultipleThreads() {
305	<	try {
306	<	final AtomicLongArray ai = new AtomicLongArray(SIZE);
307	<	for (int i = 0; i < SIZE; ++i)
308	<	ai.set(i, COUNTDOWN);
309	<	Counter c1 = new Counter(ai);
310	<	Counter c2 = new Counter(ai);
311	<	Thread t1 = new Thread(c1);
312	<	Thread t2 = new Thread(c2);
313	<	t1.start();
314	<	t2.start();
315	<	t1.join();
217	<	t2.join();
218	<	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
219	<	}
220	<	catch(InterruptedException ie) {
221	<	unexpectedException();
222	<	}
304	>	public void testCountingInMultipleThreads() throws InterruptedException {
305	>	final AtomicLongArray aa = new AtomicLongArray(SIZE);
306	>	long countdown = 10000;
307	>	for (int i = 0; i < SIZE; i++)
308	>	aa.set(i, countdown);
309	>	Counter c1 = new Counter(aa);
310	>	Counter c2 = new Counter(aa);
311	>	Thread t1 = newStartedThread(c1);
312	>	Thread t2 = newStartedThread(c2);
313	>	t1.join();
314	>	t2.join();
315	>	assertEquals(c1.decs + c2.decs, SIZE * countdown);
316		}
317
318		/**
319	<	*
320	<	*/
321	<	public void testSerialization() {
322	<	AtomicLongArray l = new AtomicLongArray(SIZE);
323	<	for (int i = 0; i < SIZE; ++i)
324	<	l.set(i, -i);
325	<
326	<	try {
327	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
328	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
329	<	out.writeObject(l);
237	<	out.close();
238	<
239	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
240	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
241	<	AtomicLongArray r = (AtomicLongArray) in.readObject();
242	<	for (int i = 0; i < SIZE; ++i) {
243	<	assertEquals(l.get(i), r.get(i));
244	<	}
245	<	} catch(Exception e){
246	<	unexpectedException();
319	>	* a deserialized/reserialized array holds same values in same order
320	>	*/
321	>	public void testSerialization() throws Exception {
322	>	AtomicLongArray x = new AtomicLongArray(SIZE);
323	>	for (int i = 0; i < SIZE; i++)
324	>	x.set(i, -i);
325	>	AtomicLongArray y = serialClone(x);
326	>	assertNotSame(x, y);
327	>	assertEquals(x.length(), y.length());
328	>	for (int i = 0; i < SIZE; i++) {
329	>	assertEquals(x.get(i), y.get(i));
330		}
331		}
332
333	+	/**
334	+	* toString returns current value.
335	+	*/
336	+	public void testToString() {
337	+	long[] a = { 17, 3, -42, 99, -7 };
338	+	AtomicLongArray aa = new AtomicLongArray(a);
339	+	assertEquals(Arrays.toString(a), aa.toString());
340	+	}
341
342		}

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